Category: esters-buliding-blocks

Okten Besli, Nur Sena; Orakdogen, Nermin published an article in 2021, the title of the article was Exploring the role of muscovite in poly(alkyl methacrylate)-based ternary nanocomposite cryogels with selective functional groups: formation via cryogelling with the aid of inorganic clay.Application of 2358-84-1 And the article contains the following content:

Easy fabrication of inorganic clay muscovite (MUS) embedded poly(2-acrylamido-2-methyl-1-propane sulfonic acid-co-diethylaminoethyl methacrylate-co-hydroxyethyl methacrylate) (PADH) nanocomposite cryogels with dual temperature/pH dependent catalytic potential was reported. Nanocomposite cryogels were fabricated by a method involving cryogelation and free radical crosslinking of aqueous systems containing MUS ranging from 0% to 1.50% (w/v). The changes in the properties of polybasic PADH networks were investigated to explain how the network parameters and gel properties were affected by the addition of clay, with the formation of a single terpolymer-MUS structure. The potential of the addition of different amounts of MUS to strengthen the prepared terpolymer matrix was investigated by uniaxial compression tests. By lowering the polymerization temperature or increasing the MUS content, the PADH/MUS nanocomposite cryogels became more elastic and compressible with stronger entanglement of terpolymer chains between the clay layers. With the addition of 1.50% (w/v) MUS, the swelling capacity was reduced by 50%, resulting in a two-fold increase in compression elasticity. The nanocomposite gels showed a strong pH-dependence, and when the pH of the swelling medium decreased from 9.8 to 2.1, there was a significant increase in the degree of swelling with increasing protonation of tertiary amine groups. Under an acidic environment, the swelling capacity of the nanocomposite gel containing 1.10% (w/v) MUS increased by 49.5%. In temperature dependent swelling between 15 and 75°C, all ternary PADH/MUS-Ngels showed a tendency to swell at low and high swelling temperatures, by the predominance of DEAEM units at low temperatures and HEMA monomers at high temperatures, resp. As the temperature was increased to 55°C, the swelling decreased and reached a min., and then the nanocomposite gels tended to swell again. The obtained results provide an insight into the effect of MUS addition on the properties of poly(alkyl methacrylate)-based ternary nanocomposite gels and demonstrate a simple and efficient way to produce multiple response systems with enhanced elasticity. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).Application of 2358-84-1

The Article related to polyalkyl methacrylate muscovite nanocomposite cryogel preparation mech property, Plastics Manufacture and Processing: Formulating Procedures and Compositions and other aspects.Application of 2358-84-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dong, Xiang; Robinson, Jerome R. published an article in 2020, the title of the article was The role of neutral donor ligands in the isoselective ring-opening polymerization of rac-β-butyrolactone.HPLC of Formula: 3976-69-0 And the article contains the following content:

Isoenriched poly-3-hydroxybutyrate (P3HB) is a biodegradable material with properties similar to isotactic polypropylene, yet efficient routes to this material are lacking after 50+ years of extensive efforts in catalyst design. In this contribution, a novel lanthanum aminobisphenolate catalyst (1-La) can access isoenriched P3HB through the stereospecific ring-opening polymerization (ROP) of rac-β-butyrolactone (rac-BBL). Replacing the tethered donor group of a privileged supporting ligand with a non-coordinating benzyl substituent generates a catalyst whose reactivity and selectivity can be tuned with inexpensive achiral neutral donor ligands (e.g. phosphine oxides, OPR3). The 1-La/OPR3 (R = n-octyl, Ph) systems display high activity and are the most isoselective homogeneous catalysts for the ROP of rac-BBL to date (0°C: Pm = 0.8, TOF ~190 h-1). Combined reactivity and spectroscopic studies provide insight into the active catalyst structure and ROP mechanism. Both 1-La(TPPO)2 and a structurally related catalyst with a tethered donor group (2-Y) operate under chain-end stereocontrol; however, 2-RE favors formation of P3HB with opposite tacticity (syndioenriched) and its ROP activity and selectivity are totally unaffected by added neutral donor ligands. Our studies uncover new roles for neutral donor ligands in stereospecific ROP, including suppression of chain-scission events, and point to new opportunities for catalyst design. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).HPLC of Formula: 3976-69-0

The Article related to butyrolactone ring opening polymerization lanthanum aminobisphenolate catalyst, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.HPLC of Formula: 3976-69-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On June 30, 2020, Su, Xiaobin; Wang, Yingyu; Peng, Xiongqi published an article.Product Details of 2358-84-1 The title of the article was An anisotropic visco-hyperelastic model for thermally-actuated shape memory polymer-based woven fabric-reinforced composites. And the article contained the following:

An anisotropic visco-hyperelastic constitutive model for thermally-actuated woven fabric-reinforced shape memory polymer composites (SMPCs) is proposed. The viscoelasticity of the shape memory polymer and anisotropic hyperelasticity of the fabric are sep. described. The second law of thermodn. is used to derive the constitutive relations through decomposing the thermodn. free energy. A woven fabric-reinforced SMPC is prepared and its thermomech. and shape memory experiments are conducted to verify the proposed model. Comparison between the predicted and experiment results indicates an good consistency, which attests that the developed model can predict the anisotropic mech. and shape memory properties of thermally induced SMPCs reinforced by woven fabrics effectively. And numerical investigation of the effect of fiber yarn orientation on the shape fixity and recovery is also performed. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).Product Details of 2358-84-1

The Article related to polymer woven fabric reinforced composite anisotropic viscohyperelastic model, Plastics Manufacture and Processing: Physical Properties and Testing Methods and other aspects.Product Details of 2358-84-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kalkan-Sevinc, Zehra; Ling, Michael T. K. published an article in 2018, the title of the article was Blending Optimization of Non-Dioctyl Phthalate Plasticized Poly(vinyl chloride) Formulations.Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate And the article contains the following content:

The use of non-ortho-phthalate plasticizers in poly(vinyl chloride) (PVC) packaging materials and medical devices has been in increasing demand due to worldwide regulatory trends to minimize or eliminate phthalate plasticizers (particularly di(2-ethylhexyl)phthalate (DEHP) or dioctyl phthalate (DOP)) in the PVC industry. This study evaluates the dry-blending cycle time of a suspension grade PVC formulated with various non-DOP plasticizers, di-(2-ethylhexyl) terephthalate (DEHT or DOTP), tris(2-ethylhexyl) trimellitate (TEHTM or TOTM) and alkyl sulfonic Ph ester (ASE), and compares them with the DOP standard A design of experiments was also conducted to study the critical dry-blending parameters for optimization of PVC formulated with only DEHT. Effects of PVC temperature (measured during plasticizer addition to the blender), plasticizer pre-heat temperature, plasticizer and lubricant concentrations and the method of plasticizer addition on the dry-blending cycle time and peak amperage of the blender were studied. The blending cycle time is shown to be related to the resultant plasticizer efficiency and the peak amperage is related to the power consumption (the energy required to mix the PVC). The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

The Article related to non dioctyl phthalate plasticizer polyvinyl chloride formulation dry blending, Plastics Manufacture and Processing: Formulating Procedures and Compositions and other aspects.Name: Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Usmanov, S. M.; Berlin, A. A.; Kochervinskii, V. V.; Sivergin, Yu. M.; Shashkova, V. T.; Zelenev, Yu. V. published an article in 1976, the title of the article was Dielectric relaxation in oligoester acrylates.Name: 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) And the article contains the following content:

The dielec. relaxation behavior for 4 oligoester acrylates (OEA) showed that glassification in the OEA was of a cooperative nature and could be described by the Onsager model. The OEA studied were α,ω-bis(methacryloyloxy)-2,2-dimethylpropylene [1985-51-9] and the α,ω-bis(methacryloyloxyethyleneoxycarbonyloxy) derivatives of propylene [60028-80-0], 2,2-dimethylpropylene [54547-48-7], and 2,2-dichloropropylene [61550-96-7]. The relaxation time spectra of the OEA reflected contributions by different forms of high-frequency intramol. motion during the α relaxation process and by the cooperative occurrence of glassification via strong intermol. interaction. The cooperative nature of the α relaxation mechanism was also indicated by low activation energy values. Calculations using the Frelikh (1960) theory for the B-T dependence at temperatures above the glass temperature indicated a nonordered orientation of dipoles. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Name: 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to dielec relaxation oligoester acrylate, glass transition oligoester acrylate, Plastics Manufacture and Processing: Physical Properties and Testing Methods and other aspects.Name: 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On July 31, 2018, Paenkaew, Sujittra; Rutnakornpituk, Metha published an article.SDS of cas: 6038-19-3 The title of the article was Effect of alkyl chain lengths on the assemblies of magnetic nanoparticles coated with multi-functional thiolactone-containing copolymer. And the article contained the following:

This work presents the synthesis of magnetite nanoparticle (MNP) coated with poly(N,N-diethylaminoethyl methacrylate)-b-poly(N-iso-Pr acrylamide-st-thiolactone acrylamide) [PDEAEMA-b-P(NIPAAm-st-TlaAm)] copolymer and its use in controlled drug release and bio-conjugation. TlaAm units in the copolymer were ring-opened with various alkyl amines to form thiol groups (-SH), followed by thiol-ene coupling reactions with acrylamide-coated MNP and then quaternized to obtain cationic copolymer-MNP assemblies (the size < 200 nm/cluster). The use of alkyl amines having various chain lengths (e.g., 1-propylamine, 1-octylamine, or 1-dodecylamine) in the nucleophilic ring-opening reactions of the thiolactone rings affected their magnetic separation ability, water dispersibility, and release rate of doxorubicin model drug. In all cases, when increasing the temperature, they showed a thermo-responsive behavior as indicated by the decrease in hydrodynamic size and the accelerated drug release rate. These copolymer-MNP assemblies could be used as a novel platform with thermal-triggering controlled drug release and capability for adsorption with any neg. charged biomols. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).SDS of cas: 6038-19-3

The Article related to magnetite nanoparticle coating diblock copolymer controlled drug release, Plastics Manufacture and Processing: Formulating Procedures and Compositions and other aspects.SDS of cas: 6038-19-3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mertens, Chiel; Aksakal, Resat; Badi, Nezha; Du Prez, Filip E. published an article in 2021, the title of the article was Sequence-defined oligoampholytes using hydrolytically stable vinyl sulfonamides: design and UCST behavior.Related Products of 6038-19-3 And the article contains the following content:

Polyampholytes, widely investigated for their distinct properties, are typically prepared via conventional polymerization techniques. This results in an ensemble of polymer chains with variation in mol. parameters such as length, ratio of charged groups and monomer order, which could influence their behavior. Here, uniform oligoampholytes with precisely positioned neg. charged carboxylate and pos. charged ammonium side-chains were synthesized using an iterative solid-phase synthesis strategy based on thiolactone chem. The amine side-chains were initially introduced via an acrylate, resulting in an amino-functionalized β-thioester that was shown to be susceptible to transesterification and hydrolysis, even under ambient conditions. While increasing the spacer length between the β-thioester and amine functionality could slow down this undesired side-reaction, it could not be completely suppressed. On the other hand, a tertiary amine-bearing vinyl sulfonamide proved to be a viable, hydrolytically stable alternative to introduce this moiety. The resulting uniform oligoampholytes are soluble in water and show UCST-type thermo responsive behavior in 85 vol% isopropanol/water mixtures The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).Related Products of 6038-19-3

The Article related to hydrolytically stable vinyl sulfonamide sequence defined oligo ampholyte, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.Related Products of 6038-19-3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On June 30, 2020, Paenkaew, Sujittra; Kajornprai, Todsapol; Rutnakornpituk, Metha published an article.SDS of cas: 6038-19-3 The title of the article was Water dispersible magnetite nanocluster coated with thermo-responsive thiolactone-containing copolymer. And the article contained the following:

This work focused on surface modification of magnetite nanoparticle (MNP) with poly(poly(ethylene glycol) monomethyl ether methacylate)-b-(poly(N-isopropylacrylamide)-st-poly(thiolactone acrylamide)), PPEGMA-b-(PNIPAAm-st-PTlaAm), diblock copolymer, synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization to obtain the particles having good water dispersible PPEGMA brushes, thermo-responsive PNIPAAm, and reactive thiolactone groups of PTlaAm. The thiolactone moiety in the copolymer can readily react with amino groups grafted on MNP surface and essentially induced the formation of MNP nanocluster. According to transmission electron microscopy (TEM), the size of the nanocluster ranged between 200 and 500 nm per cluster with 8 to 10 nm in diameter for each particle. Hydrodynamic diameter of the nanocluster significantly decreased as the dispersion temperature increased from 25° C to 45° C due to the shrinkage of thermo-responsive PNIPAAm when crossing its lower critical solution temperature (LCST). This stable nanocluster might be potentially used as a magnetic carrier for control release of entrapped entities with a thermally triggering mechanism. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).SDS of cas: 6038-19-3

The Article related to thiolactone copolymer coated magnetite nanocluster preparation property, Plastics Manufacture and Processing: Physical Properties and Testing Methods and other aspects.SDS of cas: 6038-19-3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yang, Hsinjin Edwin; Schall, Frederick P. published an article in 2016, the title of the article was Micro-scale study on the flammability of polymers.Application of 3319-31-1 And the article contains the following content:

The flammability of polymers is mainly evaluated through ignitability, flame spread and heat release. Numerous tests have been developed and performed either in laboratory scale, with certain dimension of samples, or during industrial manufacturing on final products. Several of the most widely used tests are UL 94, Oxygen Index (OI), Oxygen Bomb Calorimeter and the Cone Calorimeter. A relatively new test method using a Micro-scale Combustion Calorimeter (MCC) instrument developed by Dr. Richard Lyon of the United States Federal Aviation Administration (FAA) and standardized in ASTM International as ASTM D7309 is now com. available. The MCC test has the potential to quant. study materials flammability characteristics at the micro-scale level. With test specimens of 2 ~10 mg in mass, information, such as, ignition temperature, combustion temperature, heat release rate (HRR), heat release capacity (ηc), and total heat of combustion (HOC) is obtained. The experimental process involved the reaction of Tris(2-ethylhexyl) benzene-1,2,4-tricarboxylate(cas: 3319-31-1).Application of 3319-31-1

The Article related to polypropylene pbt pvc fluoropolymer flammability combustion calorimeter, Plastics Manufacture and Processing: Physical Properties and Testing Methods and other aspects.Application of 3319-31-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hardy, Craig; Kociok-Kohn, Gabriele; Buchard, Antoine published an article in 2022, the title of the article was UV degradation of poly(lactic acid) materials through copolymerisation with a sugar-derived cyclic xanthate.Computed Properties of 2873-29-2 And the article contains the following content:

The copolymerization of L-Lactide with a cyclic xanthate monomer derived from tri-O-acetyl-D-glucal has been used to incorporate thionocarbonate and thioester linkages into a polyester backbone. The poly(lactide-co-xanthate) copolymers show enhanced UV-degradability compared to PLA, with 40% mass loss within 6 h of UV exposure (365 nm) for only 3% of sulfur-containing linkages. The experimental process involved the reaction of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate(cas: 2873-29-2).Computed Properties of 2873-29-2

The Article related to polylactic acid sugar cyclic xanthate copolymerization uv degradation, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.Computed Properties of 2873-29-2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics